Effect of B-doping on Microstructure and Magnetic Properties of SmFe10Mo2 Alloy

doi:10.11901/1005.3093.2014.231

Chinese Journal of Materials Research

2015, Vol. 29

Issue (1): 55-59 DOI: 10.11901/1005.3093.2014.231

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Effect of B-doping on Microstructure and Magnetic Properties of SmFe₁₀Mo₂ Alloy

Naikun SUN(

),Shengjie DU,Jie GUO

School of Science, Shenyang Ligong University, Shenyang 110159, China

Cite this article:

Naikun SUN,Shengjie DU,Jie GUO. Effect of B-doping on Microstructure and Magnetic Properties of SmFe₁₀Mo₂ Alloy. Chinese Journal of Materials Research, 2015, 29(1): 55-59.

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Abstract

Ingots of SmFe₁₀Mo₂and SmFe₁₀Mo_1.5B_0.5 alloys were made by arc-melting method and followed by annealing treatment, with which nanocrystalline powders of the alloys were prepared by milling. While the effect of B-doping and ball milling on the phase composition and magnetic properties of the bulk and the nanocrystalline particles of SmFe₁₀Mo_1.5B_0.5alloy was investigated. It has been found that B-doping did not alter the crystallographic structure of the phase ThMn₁₂ in the alloy, but remarkably increased its Curie temperature from 270^oC to 334^oC. Due to the inhomogeneity of alloy compositions, correspondingly, in its thermal magnetic curve there exist two abrapt changes related with phase transformation . The post ball milling process could induce the occurrence of precipitates of Mo and α-Fe, which in turn reduce the amount of the ThMn₁₂ phase and promote the formation an non magnetic phase of Mo₂FeB₂. As a result, with the progress of ball milling process the intrinsic coercive force decreased and the saturation magnetization increased first and then decreased of the SmFe₁₀Mo_1.5B_0.5 powders. However, the nanocrystalline particles of SmFe₁₀Mo_1.5B_0.5 alloy milled for 0.5h exhibit optimal magnetic properties: _iH_c=2.2kOe and M_s=4.3kGs.

Key words: metallic materials ball milling phase structure permanent magnetic properties Curie temperature

Received: 07 May 2014

Fund: *Supported by Liaoning Provincial Natural Science Foundation No. 2013020105 and Shenyang Science and Technology Foundation No. F13-316-1-39.

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.231 OR https://www.cjmr.org/EN/Y2015/V29/I1/55

Fig.1 X-ray-diffraction patterns of the SmFe₁₀Mo_1.5B_0.5 alloy powders milled for different periods of time (a) for the bulk of SmFe₁₀Mo₂, (b) for the bulk of SmFe₁₀Mo_1.5B_0.5, (c) for the powder milled for 0.5 h, (d) for the powder milled for 1 h, (e) for the powder milled for 2h, and (f) for the powder milled for 3 h

Fig.2 SEM and electron energy spectrum of Sm₂(Fe_0.3Co_0.7)₁₇ alloy powders (a) for the powder milled for 0.5 h, and (b) for the powder milled for 2 h

Fig.3 Thermomagnetic curves of SmFe₁₀Mo₂ and SmFe₁₀Mo_1.5B_0.5 alloys (a) for SmFe₁₀Mo₂bulk, (b) for SmFe₁₀Mo_1.5B_0.5 bulk and (c) for SmFe₁₀Mo_1.5B_0.5 powder milled for 0.5 h

Fig.4 Demagnezation curves of alloys before and after B-doping (a), Demagnezation curves of SmFe₁₀Mo_1.5B_0.5 alloys milled for different periods of time (b) and magnetic properties of SmFe₁₀Mo_1.5B_0.5 alloys milled for different periods of time (c)

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